This 5/16" x 4" Trailer Coupler Pin is built specifically for trailering applications, delivering a secure, reliable way to lock your coupler latch during towing. Designed for durability and quick use, this heavy-duty wire lock pin helps prevent accidental uncoupling on the road or jobsite.

Engineered to handle demanding environments, it is ideal for dump trailers, equipment trailers, and heavy-duty towing setups, where a dependable latch pin is critical.

🔧 Key Features

• Optimized for Trailer Use
  Designed specifically for securing trailer coupler latches during transport.
• Fits Most Dump Trailer Couplers
  Compatible with a wide range of dump trailer latch mechanisms.
• Demco Coupler Compatible
  Works with most Demco-style trailer couplers, a common standard in heavy-duty towing.
• Heavy-Duty Steel Construction
  Built to withstand vibration, load stress, and repeated use in rugged conditions.
• Wire Lock Retainer
  Integrated spring wire clip ensures the pin stays securely in place while allowing quick removal.
• Corrosion-Resistant Finish
  Protects against rust, road salt, and weather exposure for long service life.

📐 Specifications

• Pin Diameter: 5/16 inch
• Usable Length: 4 inches
• Overall Length: Approx. 4-1/2"–5" (varies slightly by manufacturer)
• Material: Hardened steel
• Finish: Zinc-plated / corrosion-resistant
• Style: Wire lock (snap clip)
• Application: Trailer coupler latch locking

Trailering Applications

• Dump trailers (primary use)
• Equipment trailers
• Utility trailers
• Flatbed trailers
• Agricultural trailers

👉 Especially suited for:

• High-vibration towing conditions
• Frequent hitching/unhitching
• Heavy-load hauling

Why This Pin Matters

A coupler latch is only as secure as the pin holding it. This 5/16" heavy-duty locking pin ensures your trailer remains properly connected, reducing the risk of latch failure or accidental release—especially important when hauling heavy loads or operating dump trailers.

Ideal For

• Contractors & construction crews
• Landscaping and hauling professionals
• Trailer dealers & repair shops
• Fleet maintenance

📞 Call/Text: 517-225-1991 🌐 AAATrailer.com

What sets us apart is our dedicated team of knowledgeable professionals who are always ready to assist. Great customer service isn't just a promise—it's the foundation of our success. We invite you to visit our showroom or reach out for personalized advice. Whether you're purchasing online or stopping by, we're here to make your trailer journey seamless. Visit Us Today

• Address: 4675 East Grand River Ave, Howell, MI 48843
• Phone: (517) 225-1991 (Call or text)
• Hours: Monday to Friday: 10:00 AM - 5:30 PM | Saturday: By appointment

Thank you for considering AAA Trailer. We're excited to help you hit the road with confidence! If you have any questions, don't hesitate to contact us.

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 We will be happy to assist you with eligible returns, the return instructions, and the shipping address. If you need a return or exchange, send us an email so we can discuss a replacement.